/* Count leading and trailing zeros functions */

#ifndef _LINUX_BITOPS_COUNT_ZEROS_H_
#define _LINUX_BITOPS_COUNT_ZEROS_H_

#include "mpi-internal.h"
#ifdef __KERNEL__
#include <linux/kernel.h>
#endif

/**
 * count_leading_zeros - Count the number of zeros from the
 * MSB back
 * @x: The value
 *
 * Count the number of leading zeros from the MSB going
 * towards the LSB in @x.
 *
 * If the MSB of @x is set, the result is 0.
 * If only the LSB of @x is set, then the result is
 * BITS_PER_LONG-1. If @x is 0 then the result is
 * COUNT_LEADING_ZEROS_0.
 */
static inline int count_leading_zeros(unsigned long x)
{
    if (sizeof(x) == 4)
        return BITS_PER_LONG - fls(x);
    else
        return BITS_PER_LONG - fls64(x);
}

#define COUNT_LEADING_ZEROS_0 BITS_PER_LONG

/**
 * count_trailing_zeros - Count the number of zeros from the
 * LSB forwards
 * @x: The value
 *
 * Count the number of trailing zeros from the LSB going
 * towards the MSB in @x.
 *
 * If the LSB of @x is set, the result is 0.
 * If only the MSB of @x is set, then the result is
 * BITS_PER_LONG-1. If @x is 0 then the result is
 * COUNT_TRAILING_ZEROS_0.
 */
static inline int count_trailing_zeros(unsigned long x)
{
#define COUNT_TRAILING_ZEROS_0 (-1)

    if (sizeof(x) == 4)
        return ffs(x);
    else
        return (x != 0) ? __ffs(x) : COUNT_TRAILING_ZEROS_0;
}

#endif /* _LINUX_BITOPS_COUNT_ZEROS_H_ */
